Pretty much your usual fanservice specials but I was taken by surprise it how they built the "unseen foreshadowing" to its last episode! First time I actually seen specials with a plotline. It is short so it is really easy to see, and it actually manages to invokes bits of emotions with special 6, so if you enjoyed the series, you may as well see this.
Gotta be said, I have seen the anime awhile ago, and this just made me relieve some feelings, like the MC's sister being dead... it really made me want to see more of the story progressing, but it would be an miracle if that were to happen.